Typescript offers no runtime benefits over JavaScript like you said. However, it offers an industry leading static analysis server that makes it damn near impossible to make mistakes, and unlocks class semantics that are seen in enterprise sized software projects.

Defunct mechanical engineer here: Can draw (Fusion 360 / Onshape), 3d print (PLA), make websites, but my day job is in making cross platform mobile apps. I can also manufacture small molds from MDF (CNC router).